GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous. All the Controls products ASTM D standard. Enter now!. Standard Test Method for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter.
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However, these test methods are only intended to be used when water is the permeant liquid. For the system showed in Fig.
Originally approved in These schematics present the basic components needed to meet the objectives of Method E. In areas with extremely hard or soft water, the CaCl2 solution is recommended. There are now two? The key criterion is that the requirements covered in Section 5 have to be met. Agencies that meet the criteria of Practice D are generally considered capable of competent and objective testing, sampling, inspection, etc.
Then, apply the same air pressure to these two burettes. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Therefore, its notation should be Dh not h; however, the tradition in geotechnical engineering is to use h instead of Dh. A typical standard triaxial system with external data acquisition system includes: NOTE 11—The procedure in 9. A correction may be made for this effect, provided that changes in the length of the specimen are monitored during the test.
Temperatures outside this range may be used; however, the user would have to determine the speci? Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods. The effluent tailwater pressure shall not be decreased because air bubbles that were dissolved by the specimen water during backpressuring may come out of solution if the pressure is decreased.
For normally consolidated soils: The end pieces shall have plane and smooth surfaces and be free of cracks, chips, and discontinuities.
For instance, if k is very sensitive to volume changes then the effective consolidation stress needs to be accurately controlled; also, any volume changes during the back-pressuring process would have to be minimized. Consolidation shall be accomplished in stages, with the increase in cell pressure minus back pressure effective stress in each new stage equal to or less than the effective stress in the previous stage i.
Data are automatically transferred to the PC in real time for live plotting and monitoring of the tests in progress. In this measurement the last digit may be due to estimation, see 5. However, the following items listed may be used: The ends of the test specimen shall be cut and not troweled troweling can seal off cracks, slickensides, or other secondary features that might conduct water? If air pressure is used to control the back pressure, pressurized air will dissolve into the water, thus reducing the capacity of the water used for back pressure to dissolve air located in the pores of the test specimen.
This air pressure should be similar to the back pressure applied during testing.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The back pressure may be provided by a compressed gas supply, a deadweight acting on a piston, or any other method capable of applying and controlling the back pressure to the tolerance prescribed in this paragraph.
Rigid tubing, such as metallic or rigid thermoplastic tubing, or glass shall be used. This can asfm accomplished by individually connecting the tailwater and headwater tubing lines to clean burettes containing water at equal elevation. The quality aetm the result produced by this standard is dependent of the competence of the personnel performing it and the suitability of the equipment and facilities used. Other strategies, such as using higher viscosity fluid or properly decreasing the cross-sectional area of the test specimen, or both, may also be possible.
If the soil core is not extruded vertically, care should be astmm to avoid bending stresses on the core due to gravity. D — 03 FIG. NOTE 5—For guidance or avoiding excessive consolidation in the use of vacuum for specimen saturation, consult asm.
Strategies that may be possible when dealing with such impervious materials may include the following: Flow measurement shall be by calibrated syringe, graduated pipette, or other device of suitable accuracy. These hydraulic systems are as follows:. A typical standard triaxial system with built-in acquisition measurement includes: Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Also, measure and record any changes in specimen height, if being monitored. Temperatures outside this range may be used; however, the user would have to determine the specific gravity of mercury and R T see A controlled high-humidity room is usually used for this purpose.
A variety of techniques are available to minimize dissolution of gas in the back pressure?
ASTM D, Test equipment Controls
If the void ratio is changed, the hydraulic conductivity of the test specimen will likely change, see Appendix X2. Standard triaxial system with built-in digital data acquisition Standard triaxial System with built-in data acquisition is the ideal compact solution for performing standard triaxial tests such as effective and total stress.
A pressure gage, electronic pressure transducer, or any other device of suitable accuracy shall measure pressures to a minimum of three signi? The last d084 may be due to estimation, see 5. Periodically measure the rate of in? When the initial and? NOTE 3—De-aired water is commonly used for the cell?
Active Risk Management
In that case, the s5084 may be trimmed such that its longitudinal axis is perpendicular to the longitudinal axis of the sample. The gas pressure shall be controlled by a pressure regulator and measured by a pressure gage, electronic pressure transducer, or any other device capable of measuring to the prescribed tolerance.
Minimize uncontrolled spills by using shatterproof materials or protective shields, or both.